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Title: Humidity-resistant ambient-temperature solid-electrolyte amperometric sensing apparatus and methods

Apparatus and methods for detecting selected chemical compounds in air or other gas streams at room or ambient temperature includes a liquid-free humidity-resistant amperometric sensor comprising a sensing electrode and a counter and reference electrode separated by a solid electrolyte. The sensing electrode preferably contains a noble metal, such as Pt black. The electrolyte is water-free, non-hygroscopic, and substantially water-insoluble, and has a room temperature ionic conductivity .gtoreq.10.sup.-4 (ohm-cm).sup.-1, and preferably .gtoreq.0.01 (ohm-cm).sup.-1. The conductivity may be due predominantly to Ag+ ions, as in Ag.sub.2 WO.sub.4.4AgI, or to F- ions, as in Ce.sub.0.95 Ca.sub.0.05 F.sub.2.95. Electrical contacts serve to connect the electrodes to potentiostating and detecting circuitry which controls the potential of the sensing electrode relative to the reference electrode, detects the signal generated by the sensor, and indicates the detected signal.
Authors:
 [1]
  1. (9 S 706 William Dr., Hinsdale, IL 60521)
Publication Date:
OSTI Identifier:
873747
Report Number(s):
US 6235173
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Patent
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
humidity-resistant; ambient-temperature; solid-electrolyte; amperometric; sensing; apparatus; methods; apparatus; methods; detecting; selected; chemical; compounds; air; gas; streams; ambient; temperature; liquid-free; humidity-resistant; amperometric; sensor; comprising; sensing; electrode; counter; reference; electrode; separated; solid; electrolyte; sensing; electrode; preferably; contains; noble; metal; black; electrolyte; water-free; non-hygroscopic; substantially; water-insoluble; temperature; ionic; conductivity; gtoreq; 10; -4; ohm-cm; -1; preferably; gtoreq; 01; ohm-cm; -1; conductivity; due; predominantly; 4agi; f-; 95; 05; 95; electrical; contacts; serve; connect; electrodes; potentiostating; detecting; circuitry; controls; potential; sensing; electrode; relative; reference; electrode; detects; signal; generated; sensor; indicates; detected; signal; sensor comprising; electrode preferably; preferably contains; preferably contain; chemical compounds; electrical contacts; ionic conductivity; temperature solid; electrical contact; gas stream; solid electrolyte; ambient temperature; gas streams; reference electrode; reference electrode; noble metal; signal generated; detected signal; sensing electrode; sensing electrode; sensing electrode; sensing apparatus; selected chemical; substantially water-insoluble; electrode separated; chemical compound; solid-electrolyte amperometric; humidity-resistant ambient-temperature; amperometric sensing; ambient-temperature solid-electrolyte; detecting selected; liquid-free humidity-resistant /204/